APPENDIX E: List of Useful Atmospheric Constants and Conversions [FACTS, 220] Equatorial Radius of Earth -- 6378.39 km Polar Radius of Earth -- 6356.91 km Radius of a Sphere Having the same Volume as Earth -- 6371.22 km Angular Velocity of Rotation of Earth -- 7.292E-05 s**-1 Acceleration of Gravity at Sea Level and 45 degrees latitude -- 980.616 cm s**-2 Solar Constant -- 2.00 Langley min**-1 = 1.388E06 erg cm**-2 s**-1 Mean Solar Distance -- 1.4968E08 km Sidereal Day -- 23.93447 hr -- 23 hr 56'4.09" Velocity of Light -- 2.9979E08 m s**-1 Universal Gas Constant -- 8.3144E07 erg mole**-1 K**-1 Gas Constant for Dry Air -- 2.8704E06 erg g**-1 K**-1 Standard Molar Volume of Ideal Gas -- 22,413.6E-06 m**3 mole**-1 -- 22.4136 liters mole**-1 Molar Constant of Ideal Gas -- 8.3143 J mole**-1 K**-1 -- 8.3143E07 ergs mole**-1 K**-1 Mean Molecular Weight of Dry Air -- 28.966 g mole**-1 Molecular Weight of Water -- 18.016 g mole**-1 Specific Heat Capacity of Dry Air at Constant Pressure -- 0.240 cal g**-1 K**-1 Specific Heat Capacity of Dry Air at Constant Volume -- 0.171 cal g**-1 K**-1 Ratio of the Specific Heats of Dry Air -- 1.400 Specific Heat Capacity for Water Vapor at Constant Pressure -- 1850 J kg**-1 K**-1 Specific Heat Capacity for Water Vapor at Constant Volume -- 1390 J kg**-1 K**-1 Heats of Transformation of Phase of Water Vaporization -- 2.406E06 J kg**-1 (40 C) -- 2.501E06 J kg**-1 (0 C) -- 2.635E06 J kg**-1 (-50 C) Heats of Transformation Of Phase of Water Fusion -- 0.334E06 J kg**-1 (0 C) Heats of Transformation Of Phase of Water Sublimation -- 2.834E06 J kg**-1 (0 C) -- 2.839E06 J kg**-1 (-30 C) Stefan-Boltzmann Constant -- 8.128E-11 Langley K**-4 min**-1 Avogadro's Constant -- 6.0225E23 mole**-1 Boltzmann's Constant -- 1.3805E-23 J K**-1 Planck's Constant -- 6.6256E-34 J s**-1 Joule's Constant -- 4.186E07 ergs cal**-1 1 degree Latitude at 45 degrees N or S -- 111.1 km -- 59.96 nautical miles -- 69.05 statute miles 1 m s**-1 -- 1.94 knots -- 2.24 mph -- 3.28 ft s**-1 -- 3.60 kph 1 atmosphere -- 1013.25 mb -- 760.000 mm of mercury -- 29.921 inches of mercury -- 1.01325E06 dynes cm**-2 1 calorie -- 4.186E07 ergs Melting Point of Ice -- 0.00 degrees C -- 32.00 degrees F -- 273.16 K